
#region Using Statements
using System;
using System.Collections.Generic;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using System.Diagnostics;
#endregion

namespace block_explorer.Util
{
    public partial class QuadRenderComponent : Microsoft.Xna.Framework.DrawableGameComponent
    {
        #region Private Members
        
        VertexPositionTexture[] verts = null;
        short[] ib = null;

        #endregion

        static private QuadRenderComponent mInstance;
        static public QuadRenderComponent Instance { get { return mInstance; } }

        #region Constructor
        public QuadRenderComponent(Game game)
            : base(game)
        {
            // TODO: Construct any child components here
            Debug.Assert(mInstance == null, "Should only ever have one!");
            mInstance = this;
        } 
        #endregion


        #region LoadGraphicsContent

        protected override void LoadContent()
        {
                IGraphicsDeviceService graphicsService = 
                    (IGraphicsDeviceService)base.Game.Services.GetService(
                                                typeof(IGraphicsDeviceService));

                verts = new VertexPositionTexture[]
                        {
                            new VertexPositionTexture(
                                new Vector3(0,0,1),
                                new Vector2(1,1)),
                            new VertexPositionTexture(
                                new Vector3(0,0,1),
                                new Vector2(0,1)),
                            new VertexPositionTexture(
                                new Vector3(0,0,1),
                                new Vector2(0,0)),
                            new VertexPositionTexture(
                                new Vector3(0,0,1),
                                new Vector2(1,0))
                        };

                ib = new short[] { 0, 1, 2, 2, 3, 0 };

        } 
        #endregion


        #region void Render(Vector2 v1, Vector2 v2)
        public void Render(Vector2 v1, Vector2 v2)
        {
            IGraphicsDeviceService graphicsService = (IGraphicsDeviceService)
                base.Game.Services.GetService(typeof(IGraphicsDeviceService));

            GraphicsDevice device = graphicsService.GraphicsDevice;

            verts[0].Position.X = v2.X;
            verts[0].Position.Y = v1.Y;

            verts[1].Position.X = v1.X;
            verts[1].Position.Y = v1.Y;

            verts[2].Position.X = v1.X;
            verts[2].Position.Y = v2.Y;

            verts[3].Position.X = v2.X;
            verts[3].Position.Y = v2.Y;

            device.DrawUserIndexedPrimitives<VertexPositionTexture>
                (PrimitiveType.TriangleList, verts, 0, 4, ib, 0, 2);
        }
        #endregion
    }
}
